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Display device having touch panel

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Title: Display device having touch panel.
Abstract: The present invention provides a display device having a touch panel including: a display panel; a capacitance-type touch panel arranged on the display panel; and a front panel arranged on the capacitance-type touch panel, wherein the capacitance-type touch panel includes a plurality of X-electrodes and Y-electrodes, the capacitance-type touch panel and the front panel are attached to each other at peripheral portions of the capacitance-type touch panel using adhesives, a conductive film that is provided so as to surround an effective touch area of the capacitance-type touch panel is provided on the uppermost layer of the capacitance-type touch panel, predetermined electric potential is supplied to the conductive film, and the conductive film overlaps peripheral portions of the effective touch area of the capacitance-type touch panel in planar view. ...


Browse recent Hitachi Displays, Ltd. patents - ,
Inventor: Kouji HAYAKAWA
USPTO Applicaton #: #20120092292 - Class: 345174 (USPTO) - 04/19/12 - Class 345 


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The Patent Description & Claims data below is from USPTO Patent Application 20120092292, Display device having touch panel.

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CLAIM OF PRIORITY

The present application claims priority from Japanese Patent Application JP 2010-231091 filed on Oct. 14, 2010, the content of which is hereby incorporated by reference into this application.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a display device having a capacitance-type touch panel, and particularly to a technique that is effective in preventing false operations at peripheral portions of the touch panel.

2. Description of the Related Art

A display device equipped with a device (hereinafter, also referred to as a touch sensor or a touch panel) for inputting information on a display screen with a touch operation (touch and press operation, hereinafter, simply referred to as touch) using a finger of a user or a pen is used in mobile electronic devices such as PDAs and mobile terminals, a wide variety of home electric appliances, automated teller machines, and the like. There have been known a resistive film-type touch panel for detecting changes in resistance values at a touched portion, a capacitance-type touch panel for detecting changes in capacity at a touched portion, and an optical sensor-type touch panel for detecting changes in the amount of light.

For example, Japanese Unexamined Patent Application Publication No. 2003-511799 discloses such a capacitance-type touch panel. In the capacitance-type touch panel disclosed in

Japanese Unexamined Patent Application Publication No. 2003-511799, electrodes (X-electrodes) for detection in the vertical direction and electrodes (Y-electrodes) for detection in the horizontal direction that are arranged in a two-dimensional matrix are provided to detect the capacity of each electrode with an input processor. In the case where a surface of the touch panel is touched with a conductor such as a finger, the capacity of each electrode is increased. Thus, the increase is detected by the input processor and the input coordinates are calculated on the basis of a signal of changes in capacity detected at each electrode.

As a general structure of a conventional capacitance-type touch panel, a front panel is entirely attached to a front surface of the capacitance-type touch panel using adhesives. The front panel is formed on the uppermost layer and is accordingly exposed. Thus, the front panel is scratched or tainted, and needs to be exchanged.

However, when exchanging the front panel, the touch panel also needs to be exchanged in the conventional structure. Thus, there have been requests to exchange only the front panel. In order to respond to the requests, it is only necessary to attach the front panel and the capacitance-type touch panel to each other only at peripheral portions, and thus only the front panel can be easily exchanged with this structure.

However, in the capacitance-type touch panel with the structure in which the front panel and the touch panel are attached to each other only at the peripheral portions, when the front panel is pressed relatively hard, the interval between the front panel and the touch panel becomes narrow or wide because the peripheral portions of the touch panel are fixed to the front panel using the adhesives.

In this case, the capacitance-type touch panel also detects changes in the thickness of an interval layer (a so-called air layer) between the front panel and the touch panel, and thus false reaction possibly occurs at the peripheral portions of the touch panel, leading to false operations.

SUMMARY

OF THE INVENTION

The present invention has been achieved to solve the problems of the conventional technique, and an object thereof is to provide a technique enabling to prevent false operations at peripheral portions of a touch panel in a display device having a capacitance-type touch panel in which a front panel and the touch panel are attached to each other only at the peripheral portions.

The above and other objects and novel characteristics of the present invention will become apparent from the description of the specification and the accompanying drawings.

The followings are representative summarized aspects of the present invention disclosed in this application.

In order to achieve the above-described object, the present invention provides a display device having a touch panel including: a capacitance-type touch panel arranged on a display panel; and a front panel arranged on the capacitance-type touch panel, wherein the capacitance-type touch panel includes a plurality of X-electrodes and Y-electrodes, the capacitance-type touch panel and the front panel are attached to each other at peripheral portions of the capacitance-type touch panel using adhesives, a conductive film that is provided so as to surround an effective touch area of the capacitance-type touch panel is provided on the uppermost layer of the capacitance-type touch panel, predetermined electric potential (for example, ground electric potential) is supplied to the conductive film, and the conductive film overlaps peripheral portions of the effective touch area of the capacitance-type touch panel in planar view.

In the present invention, end portions of the conductive film where the peripheral portions of the effective touch area of the capacitance-type touch panel overlap are positioned within a range of 3 mm to 5 mm of the peripheral portions of the effective touch area of the capacitance-type touch panel in planar view.

In the present invention, wirings coupled to the plurality of X-electrodes and Y-electrodes are formed outside the effective touch area of the capacitance-type touch panel, and the end portions of the conductive film where the peripheral portions of the effective touch area of the capacitance-type touch panel overlap are positioned within a range of 5 mm from connection portions between the plurality of X-electrodes and Y-electrodes and the wirings in planar view.

In the present invention, the end portions of the conductive film where the peripheral portions of the effective touch area of the capacitance-type touch panel overlap are positioned within a range of 3 mm to 5 mm from the adhesives in planar view.

In the present invention, a slit is provided across the conductive film.

The followings are summarized effects obtained from representative aspects of the present invention disclosed in this application.

According to the present invention, it is possible to prevent false operations at peripheral portions of a touch panel in a display device having a capacitance-type touch panel in which a front panel and the touch panel are attached to each other only at the peripheral portions.

BRIEF DESCRIPTION OF THE DRAWINGS



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Previous Patent Application:
Controller architecture for combination touch, handwriting and fingerprint sensor
Next Patent Application:
Multi-touch panel capacitance sensing circuit
Industry Class:
Computer graphics processing, operator interface processing, and selective visual display systems
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stats Patent Info
Application #
US 20120092292 A1
Publish Date
04/19/2012
Document #
13270294
File Date
10/11/2011
USPTO Class
345174
Other USPTO Classes
International Class
06F3/044
Drawings
10



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